Unit 4 lesson 2 Who´s vs whose

1 . Whose school is this ? It´s our school . It´s ____________________ .
2 . Whose book is this ? It´s my book . It´s ____________________ .
3 . Whose idea is this ? It´s your idea . It´s ____________________ .
4 . Whose tickets are those ? Those are their tickets . They´re ____________________ .
5 . Whose pens are these ? These are your pens . They´re ____________________ .